Mattress



FIG. 1 is a top view of our design for a mattress. The bottom of themattress is plain and includes no ornamentality.

FIG. 2 is a right side view thereof. The left side view is a mirrorimage of the right side view.

FIG. 3 is a front view thereof. The rear view of our design is a mirrorimage of the front view.

FIG. 4 is an enlarged partial front view, taken from detail 4 of FIG. 3;and,

FIG. 5 is an enlarged partial side view, taken from detail 5 of FIG. 3.

The ornamental design for a mattress, as shown and described.